Django全文搜索：如何组合多个查询和向量？

Question

我有一个带有三个输入的表格：category，location和keywords。

如果在表格中填写了所有三个字段，则结果之间的关系应为ADD，否则只能通过location来获取结果。

我一直在尝试将这三个输入组合在一起以进行Django全文搜索，但它仅获取与location匹配的结果。

这是我的views.py代码：

class SearchServices(generic.ListView):
    model = Service
    context_object_name = 'services'
    template_name = 'services/search.html'

    def get_queryset(self):
        qs = Service.objects

        if self.request.GET['location'] != '':
            lat_long = self.request.GET['location'].split(',')
            user_location = Point(float(lat_long[1]), float(lat_long[0]), srid=4326)

        keywords = self.request.GET['keywords']
        category = self.request.GET['category']

        query = SearchQuery(keywords) & SearchQuery(category)
        vector = SearchVector('title', 'description', StringAgg('tag__name', delimiter=' ')) + SearchVector(StringAgg('category__slug', delimiter=' '))
        if self.request.GET['location'] != '':
            qs = qs.filter(location__distance_lte=(user_location, D(km=2)))
        if category != '':
            qs = qs.annotate(search=vector).filter(search=query).distinct()
            qs = qs.annotate(rank=SearchRank(vector, query)).order_by('-rank')
        qs = qs.annotate(distance=Distance('location', user_location)).order_by('distance')

        return qs

任何关于我在这里做错事情的指针都将受到高度赞赏。

Answer 1

我认为您的问题与上一条注释行中未定义的user_location有关。尝试这样的事情：

class SearchServices(generic.ListView):
    model = Service
    context_object_name = 'services'
    template_name = 'services/search.html'

    def get_queryset(self):
        qs = Service.objects.all()

        request_location = self.request.GET.get('location', '')
        request_keywords = self.request.GET.get('keywords', '')
        request_category = self.request.GET.get('category', '')

        query = SearchQuery(request_keywords) & SearchQuery(request_category)

        vector = SearchVector(
            'title',
            'description',
            StringAgg('tag__name', delimiter=' ')
        ) + SearchVector(
            StringAgg('category__slug', delimiter=' ')
        )

        if request_category != '':
            qs = qs.annotate(search=vector).filter(search=query).distinct()
            qs = qs.annotate(rank=SearchRank(vector, query)).order_by('-rank')

        if len(request_location.split(',')) == 2:
            lat_long = request_location.split(',')
            user_location = Point(float(lat_long[1]), float(lat_long[0]), srid=4326)
            qs = qs.filter(location__distance_lte=(user_location, D(km=2)))
            qs = qs.annotate(
                distance=Distance('location', user_location)
            ).order_by('distance')

        return qs